Combine all condimento ingredients and whisk vigorously. Let sit while you prep and grill the steak.
Liberally apply sea salt and black pepper to skirt steak and grill over a screaming hot fire, about 2 minutes per side.
Let steak rest for 10 minutes on a cutting board, uncovered.
Slice steak against the grain, pile onto a platter, give the condimento another vigorous whisk and pour over the slices of steak.